;;; ob-awk.el --- Babel Functions for Awk -*- lexical-binding: t; -*-
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;; Copyright (C) 2011-2018 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Babel's awk can use special header argument:
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;;
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;; - :in-file takes a path to a file of data to be processed by awk
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;;
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;; - :stdin takes an Org data or code block reference, the value of
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;; which will be passed to the awk process through STDIN
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;;; Code:
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(require 'ob)
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(require 'org-compat)
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(declare-function org-babel-ref-resolve "ob-ref" (ref))
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(declare-function orgtbl-to-generic "org-table" (table params))
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(defvar org-babel-tangle-lang-exts)
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(add-to-list 'org-babel-tangle-lang-exts '("awk" . "awk"))
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(defvar org-babel-awk-command "awk"
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"Name of the awk executable command.")
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(defun org-babel-expand-body:awk (body _params)
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"Expand BODY according to PARAMS, return the expanded body."
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body)
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(defun org-babel-execute:awk (body params)
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"Execute a block of Awk code with org-babel. This function is
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called by `org-babel-execute-src-block'"
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(message "executing Awk source code block")
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(let* ((result-params (cdr (assq :result-params params)))
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(cmd-line (cdr (assq :cmd-line params)))
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(in-file (cdr (assq :in-file params)))
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(full-body (org-babel-expand-body:awk body params))
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(code-file (let ((file (org-babel-temp-file "awk-")))
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(with-temp-file file (insert full-body)) file))
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(stdin (let ((stdin (cdr (assq :stdin params))))
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(when stdin
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(let ((tmp (org-babel-temp-file "awk-stdin-"))
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(res (org-babel-ref-resolve stdin)))
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(with-temp-file tmp
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(insert (org-babel-awk-var-to-awk res)))
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tmp))))
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(cmd (mapconcat #'identity
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(append
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(list org-babel-awk-command
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"-f" code-file cmd-line)
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(mapcar (lambda (pair)
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(format "-v %s='%s'"
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(car pair)
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(org-babel-awk-var-to-awk
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(cdr pair))))
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(org-babel--get-vars params))
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(list in-file))
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" ")))
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(org-babel-reassemble-table
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(let ((results
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(cond
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(stdin (with-temp-buffer
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(call-process-shell-command cmd stdin (current-buffer))
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(buffer-string)))
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(t (org-babel-eval cmd "")))))
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(when results
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(org-babel-result-cond result-params
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results
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(let ((tmp (org-babel-temp-file "awk-results-")))
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(with-temp-file tmp (insert results))
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(org-babel-import-elisp-from-file tmp)))))
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(org-babel-pick-name
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(cdr (assq :colname-names params)) (cdr (assq :colnames params)))
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(org-babel-pick-name
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(cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))
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(defun org-babel-awk-var-to-awk (var &optional sep)
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"Return a printed value of VAR suitable for parsing with awk."
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(let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
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(cond
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((and (listp var) (listp (car var)))
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(orgtbl-to-generic var (list :sep (or sep "\t") :fmt echo-var)))
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((listp var)
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(mapconcat echo-var var "\n"))
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(t (funcall echo-var var)))))
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(provide 'ob-awk)
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;;; ob-awk.el ends here
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